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<div class="titlepage"><div><div><h4 class="title">
<a name="boost_test.tests_organization.fixtures.models"></a><a class="link" href="models.html" title="Fixture models">Fixture
        models</a>
</h4></div></div></div>
<p>
          Several fixture interfaces are supported by the <span class="emphasis"><em>Unit Test Framework</em></span>.
          The choice of the interface depends mainly on the usage of the fixture.
        </p>
<h4>
<a name="boost_test.tests_organization.fixtures.models.h0"></a>
          <span class="phrase"><a name="boost_test.tests_organization.fixtures.models.fixture_class_model"></a></span><a class="link" href="models.html#boost_test.tests_organization.fixtures.models.fixture_class_model">Fixture
          class model</a>
        </h4>
<p>
          The <span class="emphasis"><em>Unit Test Framework</em></span> defines the generic fixture
          class model as follows:
        </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="special">&lt;</span><span class="identifier">fixture</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;{</span>
  <span class="special">&lt;</span><span class="identifier">fixture</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;();</span>      <span class="comment">// setup function</span>
  <span class="special">~&lt;</span><span class="identifier">fixture</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;();</span>     <span class="comment">// teardown function</span>
<span class="special">};</span>
</pre>
<p>
          In other words a fixture is expected to be implemented as a class where
          the class constructor serves as a <code class="computeroutput"><span class="identifier">setup</span></code>
          method and class destructor serves as <code class="computeroutput"><span class="identifier">teardown</span></code>
          method.
        </p>
<p>
          The class model above has some limitations though:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              it is not possible to have exceptions in the teardown function, especially
              any test assertions that aborts the current test case is not possible
              (as those use exceptions)
            </li>
<li class="listitem">
              it is sometimes more natural to use the constructor/destructor to perform
              the necessary resource allocation/release of the fixture, and that
              will be consumed in the test cases, and check for the proper state
              of the fixture in separate functions. Those checks are the pre-conditions
              for the test case to run, and the post-conditions that should be met
              after the test case has been running.
            </li>
</ul></div>
<p>
          This is why the <span class="emphasis"><em>Unit Test Framework</em></span> also supports
          (Boost 1.65 on) optional <code class="computeroutput"><span class="identifier">setup</span></code>
          and/or <code class="computeroutput"><span class="identifier">teardown</span></code> functions
          as follow:
        </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="special">&lt;</span><span class="identifier">fixture</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;{</span>
  <span class="special">&lt;</span><span class="identifier">fixture</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;();</span>      <span class="comment">// ctor</span>
  <span class="special">~&lt;</span><span class="identifier">fixture</span><span class="special">-</span><span class="identifier">name</span><span class="special">&gt;();</span>     <span class="comment">// dtor</span>
  <span class="keyword">void</span> <span class="identifier">setup</span><span class="special">();</span>          <span class="comment">// setup, optional</span>
  <span class="keyword">void</span> <span class="identifier">teardown</span><span class="special">();</span>       <span class="comment">// teardown, optional</span>
<span class="special">};</span>
</pre>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
            As mentioned, the declaration/implementation of the <code class="computeroutput"><span class="identifier">setup</span></code>
            and <code class="computeroutput"><span class="identifier">teardown</span></code> are optional:
            the <span class="emphasis"><em>Unit Test Framework</em></span> will check the existence
            of those and will call them adequately. However in C++98, it is not possible
            to detect those declaration in case those are inherited (it works fine
            for compiler supporting <code class="computeroutput"><span class="keyword">auto</span></code>
            and <code class="computeroutput"><span class="keyword">decltype</span></code>).
          </p></td></tr>
</table></div>
<p>
          This model is expected from fixtures used with <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_case_fixture.html" title="BOOST_FIXTURE_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span></code></a> and <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_suite_fixture.html" title="BOOST_FIXTURE_TEST_SUITE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_SUITE</span></code></a>.
        </p>
<h4>
<a name="boost_test.tests_organization.fixtures.models.h1"></a>
          <span class="phrase"><a name="boost_test.tests_organization.fixtures.models.flexible_models"></a></span><a class="link" href="models.html#boost_test.tests_organization.fixtures.models.flexible_models">Flexible
          models</a>
        </h4>
<p>
          In addition to <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_case_fixture.html" title="BOOST_FIXTURE_TEST_CASE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_CASE</span></code></a> and <a class="link" href="../../utf_reference/test_org_reference/test_org_boost_test_suite_fixture.html" title="BOOST_FIXTURE_TEST_SUITE"><code class="computeroutput"><span class="identifier">BOOST_FIXTURE_TEST_SUITE</span></code></a> the
          <span class="emphasis"><em>Unit Test Framework</em></span> allows to associate fixture with
          test unit using the decorator <a class="link" href="../../utf_reference/test_org_reference/decorator_fixture.html" title="fixture (decorator)"><code class="computeroutput"><span class="identifier">fixture</span></code></a>. This decorator supports
          additional models for declaring the <code class="computeroutput"><span class="identifier">setup</span></code>
          and <code class="computeroutput"><span class="identifier">teardown</span></code>:
        </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
              a fixture defined according to the fixture class model above
            </li>
<li class="listitem">
<p class="simpara">
              a fixture defined according to the extended fixture class model, which
              allows for the fixture constructor to takes one argument. For example:
            </p>
<pre class="programlisting"><span class="keyword">struct</span> <span class="identifier">Fx</span>
<span class="special">{</span>
  <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">s</span><span class="special">;</span>
  <span class="identifier">Fx</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">s_</span> <span class="special">=</span> <span class="string">""</span><span class="special">)</span> <span class="special">:</span> <span class="identifier">s</span><span class="special">(</span><span class="identifier">s_</span><span class="special">)</span>
      <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"ctor "</span> <span class="special">&lt;&lt;</span> <span class="identifier">s</span><span class="special">);</span> <span class="special">}</span>
  <span class="keyword">void</span> <span class="identifier">setup</span><span class="special">()</span>
      <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"optional setup "</span> <span class="special">&lt;&lt;</span> <span class="identifier">s</span><span class="special">);</span> <span class="special">}</span>
  <span class="keyword">void</span> <span class="identifier">teardown</span><span class="special">()</span>
      <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"optional teardown "</span> <span class="special">&lt;&lt;</span> <span class="identifier">s</span><span class="special">);</span> <span class="special">}</span>
  <span class="special">~</span><span class="identifier">Fx</span><span class="special">()</span>
      <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"dtor "</span> <span class="special">&lt;&lt;</span> <span class="identifier">s</span><span class="special">);</span> <span class="special">}</span>
<span class="special">};</span>
</pre>
</li>
<li class="listitem">
<p class="simpara">
              a fixture defined as a pair of free functions for the <code class="computeroutput"><span class="identifier">setup</span></code> and <code class="computeroutput"><span class="identifier">teardown</span></code>
              (latter optional)
            </p>
<pre class="programlisting"><span class="keyword">void</span> <span class="identifier">setup</span><span class="special">()</span> <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"set up"</span><span class="special">);</span> <span class="special">}</span>
<span class="keyword">void</span> <span class="identifier">teardown</span><span class="special">()</span> <span class="special">{</span> <span class="identifier">BOOST_TEST_MESSAGE</span><span class="special">(</span><span class="string">"tear down"</span><span class="special">);</span> <span class="special">}</span>
</pre>
</li>
</ul></div>
<p>
          For complete example of test module which uses these models please check
          decorator <a class="link" href="../../utf_reference/test_org_reference/decorator_fixture.html" title="fixture (decorator)"><code class="computeroutput"><span class="identifier">fixture</span></code></a>.
        </p>
</div>
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      contributors<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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